I managed to catch the tail end of the NASA press conference this morning. This had created quite a flutter on the internet with some speculating that NASA was going to announce the discovery of evidence for extraterrestrial life.

Well, it proved to be a bit more realistic than that – but nevertheless quite exciting. The press conference discussed research indicating the possibility that arsenic can substitute for phosphorus in a bacteria. Neil deGrasse Tyson explained this in a brief tweet:

Life is mostly composed of the elements carbon, hydrogen, nitrogen, oxygen, sulfur, and phosphorus. Although these six elements make up nucleic acids, proteins, and lipids and thus the bulk of living matter, it is theoretically possible that some other elements in the periodic table could serve the same functions. Here, we describe a bacterium, strain GFAJ-1 of the Halomonadaceae, isolated from Mono Lake, California, which substitutes arsenic for phosphorus to sustain its growth. Our data show evidence for arsenate in macromolecules that normally contain phosphate, most notably nucleic acids and proteins. Exchange of one of the major bioelements may have profound evolutionary and geochemical significance.

And here is a short video on the work:

NASA’s Alien Life News: The Real Story from Sci…, posted with vodpod

The scientists at the press conference disagreed on the actual role of the arsenic and how stable such life forms could be. Clearly more work will be done on this and Wolfe-Simon is publishing further results in February.

This is way out of my area of expertise so I won’t comment further on the research. But I was interested to here the scientists and reporters discuss the feelings that often come with significant discoveries. Ryan Anderson from The Martian Chronicles expressed my thoughts exactly with his comment:

I thought it was great to hear Wolfe-Simon say during the question session that there wasn’t a ’eureka moment’ where they knew what they had found, it was more like ’Hey, this isn’t right.’ It reminds me of this Isaac Asimov quote:

The most exciting phrase to hear in science, the one that heralds new discoveries, is not ‘Eureka!’ (I’ve found it!), but ‘That’s funny…’ -Isaac Asimov.

Sciblogs Archive

Sciblogs is the biggest blog network of scientists in New Zealand, an online forum for discussion of everything from clinical health to climate change. Our Scibloggers are either practising scientists or have been writing on science-related issues for some time. They welcome your feedback!

Sciblogs was created by the Science Media Centre and is independently funded